Algodoo

A simple motor gun with an auto reloading mechanism. You know, that kind of gun that you made when you were new to phun, but this time it has some kind of a magazine on it (un-detachable).
Tap the \ Key to toggle between firing and loading modes.
Hit and hold Enter/Return for a little bit, maybe half a second to fire.
Holds five bullets, or six if you're a bullet pig.